CVE-2021-3111

Name: CVE-2021-3111
Creator: NVD / NIST
Published: 2021-01-08T15:15:12.953+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 3.01%

Last modified Jun 17, 2026

CVE-2021-3111 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. The Express Entries Dashboard in Concrete5 8.5.4 allows stored XSS via the name field of a new data object at an index.php/dashboard/express/entries/view/ URI.. EPSS estimates a 3.01% chance of exploitation in the next 30 days.

Description

The Express Entries Dashboard in Concrete5 8.5.4 allows stored XSS via the name field of a new data object at an index.php/dashboard/express/entries/view/ URI.

Metrics

CVSS 3.1

4.8/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

3.01%

85.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Concretecms	Concrete Cms	< 8.5.5

References

http://packetstormsecurity.com/files/161600/Concrete5-8.5.4-Cross-Site-Scripting.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/161997/Concrete5-8.5.4-Cross-Site-Scripting.htmlThird Party Advisory, VDB Entry
https://documentation.concrete5.org/developers/introduction/version-historyRelease Notes, Vendor Advisory
https://documentation.concrete5.org/developers/introduction/version-history/855-release-notesRelease Notes, Vendor Advisory
https://github.com/Quadron-Research-Lab/CVE/blob/main/CVE-2021-3111.pdfExploit, Third Party Advisory
http://packetstormsecurity.com/files/161600/Concrete5-8.5.4-Cross-Site-Scripting.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/161997/Concrete5-8.5.4-Cross-Site-Scripting.htmlThird Party Advisory, VDB Entry
https://documentation.concrete5.org/developers/introduction/version-historyRelease Notes, Vendor Advisory
https://documentation.concrete5.org/developers/introduction/version-history/855-release-notesRelease Notes, Vendor Advisory
https://github.com/Quadron-Research-Lab/CVE/blob/main/CVE-2021-3111.pdfExploit, Third Party Advisory

Timeline

Published: Jan 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3111?

The Express Entries Dashboard in Concrete5 8.5.4 allows stored XSS via the name field of a new data object at an index.php/dashboard/express/entries/view/ URI.

How severe is CVE-2021-3111?

CVE-2021-3111 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 3.01% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3111?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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Source: NVD / NIST